Another benefit of this hack Is to help avoid corroding. Tubing is always in contact with water and eventually rust and corrode. The aluminum foil is used to prevent water directly touching the metal pipes. This saves you from paying for your plumbing to be replaced multiple times, which can be costly. I had a pipe once that rusted through and dribbled water behind the wall. By the time I figured out what had happened, it was a small disaster. Had I realized that a piece of aluminum foil could have saved all that, I would have done it in a heartbeat.
Noise Reduction
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